zh/builder/src/echarts3/component/axisPointer/findPointFromSeries.js

import * as zrUtil from 'zrender/src/core/util';
import * as modelUtil from '../../util/model';
/**
 * @param {Object} finder contains {seriesIndex, dataIndex, dataIndexInside}
 * @param {module:echarts/model/Global} ecModel
 * @return {Object} {point: [x, y], el: ...} point Will not be null.
 */

export default function (finder, ecModel) {
  var point = [];
  var seriesIndex = finder.seriesIndex;
  var seriesModel;

  if (seriesIndex == null || !(seriesModel = ecModel.getSeriesByIndex(seriesIndex))) {
    return {
      point: []
    };
  }

  var data = seriesModel.getData();
  var dataIndex = modelUtil.queryDataIndex(data, finder);

  if (dataIndex == null || zrUtil.isArray(dataIndex)) {
    return {
      point: []
    };
  }

  var el = data.getItemGraphicEl(dataIndex);
  var coordSys = seriesModel.coordinateSystem;

  if (seriesModel.getTooltipPosition) {
    point = seriesModel.getTooltipPosition(dataIndex) || [];
  } else if (coordSys && coordSys.dataToPoint) {
    point = coordSys.dataToPoint(data.getValues(zrUtil.map(coordSys.dimensions, function (dim) {
      return seriesModel.coordDimToDataDim(dim)[0];
    }), dataIndex, true)) || [];
  } else if (el) {
    // Use graphic bounding rect
    var rect = el.getBoundingRect().clone();
    rect.applyTransform(el.transform);
    point = [rect.x + rect.width / 2, rect.y + rect.height / 2];
  }

  return {
    point: point,
    el: el
  };
}